LS3 and V6 engines have been out for a while they are not new. Many performance modifications already out there for them.

PS - And the car is not being built for two more months, we already have companies talking about superchargers, long tubes, and gauge cluster options. Some of these accessories have been known for months. Some we have never heard of, but I am sure that the aftermarket is going to be gargantuan so don't worry.